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Dual‐stopband filter using metamaterial hexagonal mushroom resonator
Author(s) -
Awasthi Seema,
Biswas Animesh,
Akhtar Mohammed Jaleel
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28063
Subject(s) - stopband , metamaterial , resonator , filter (signal processing) , coupling coefficient of resonators , split ring resonator , topology (electrical circuits) , materials science , elliptic filter , microwave , band stop filter , optoelectronics , electronic engineering , low pass filter , engineering , telecommunications , electrical engineering
In this article, dual‐stopband filter based on metamaterial hexagonal mushroom resonator is presented first time. Here, hexagonal mushroom resonators are used to synthesize planar microwave filter using the coupling coefficient approach based on frequency transformation. There are different approaches to implement dual‐band filters among which frequency transformation technique is advantageous than other methods in terms of complexity to find the transfer functions. So it is applied here to generate the coupling matrix of direct coupled dual‐stopband filter. For easy tuning, filter has been synthesized in cul‐de‐sac topology that is suitable for band stop filter realization and eliminates the need for diagonal couplings. Finally, a six‐pole direct‐coupled dual‐stopband filter in cul‐de‐sac configuration has been fabricated using hexagonal metamaterial mushroom resonator. Excellent agreement between simulation and experimental result has been achieved. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:326–329, 2014